Before an XMM-Newton observation can be released for scheduling, several checks must be completed to ensure that the proposed instrumental configuration is safe and adequate for the scientific proposal goals. This process is called proposal enhancement. Only after the proposal enhancement process is successfully completed, an XMM-Newton observation can be released for scheduling. The PIs of accepted observations which cannot be performed as requested through the XRPS will be contacted by the XMM-Newton SOC at the most appropriate time, to start the enhancement process.
During the proposal enhancement, changes of observations are allowed as long as they are in agreement with the scientific justification of the proposal and approved by SOC and the Project Scientist. The proposed prime instrument is considered to be a substantial component of the scientific claim. Changes leading to unforeseen duplications or violations of data rights are not allowed.